Feeding preference of recaptured Atlantic salmon Salmo salar following simulated escape from fish pens during autumn
Escapes of farmed fish from coastal farms around the world are believed to have genetic and ecological consequences for wild fish populations. Each year there are numerous escapes of adult farmed Atlantic salmon Salmo salar. However, survival until maturity appears to be low. One possible explanatio...
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Online Access: | http://hdl.handle.net/11250/117160 https://doi.org/10.3354/aei00015 |
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ftimr:oai:imr.brage.unit.no:11250/117160 2023-05-15T15:32:00+02:00 Feeding preference of recaptured Atlantic salmon Salmo salar following simulated escape from fish pens during autumn Olsen, Rolf Erik Skilbrei, Ove 2010-12-21 application/pdf http://hdl.handle.net/11250/117160 https://doi.org/10.3354/aei00015 eng eng Inter-Research urn:issn:1869-215X urn:issn:1869-7534 http://hdl.handle.net/11250/117160 http://dx.doi.org/10.3354/aei00015 167-174 1 Aquaculture Environment Interactions 2 salmon fatty acids laks fettsyrer VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Aquaculture: 922 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 Journal article Peer reviewed 2010 ftimr https://doi.org/10.3354/aei00015 2021-09-23T20:14:49Z Escapes of farmed fish from coastal farms around the world are believed to have genetic and ecological consequences for wild fish populations. Each year there are numerous escapes of adult farmed Atlantic salmon Salmo salar. However, survival until maturity appears to be low. One possible explanation is that many of these salmon have difficulties switching to live prey. To address this possibility, growth rate and dietary preference were recorded in recaptured salmon released in 3 groups from August to October 2008 within a small fjord in south-western Norway (Masfjord). The fish were primed with a commercial diet containing 11% of the ‘vegetable oil marker’ 18:2n-6 before release. In the 14.5 to 35.1% of fish recaptured, growth rates were generally good (0.21–1.23% d–1 of fish recaptured in main fjord >2 mo after release), with body weight doubled or more for fish recaptured after 19 wk and thereafter. However, fish recaptured in a small arm of Masfjord (Hopsvåg) had a growth rate close to zero and were in poor condition. While stomachs of recaptured fish were generally empty in the first weeks after release, pellets from fish farms were found in more than 80% of the stomachs after 12 wk and thereafter. Additionally, the level of 18:2n-6 in depot lipids (11% of fatty acids) of the muscle indicated that none of the fish recaptured the following autumn and winter in the vicinity of the release site had switched to wild prey diets. Salmon that escape during autumn are unlikely to compete for prey with wild fish in the vicinity of the release site. Article in Journal/Newspaper Atlantic salmon Salmo salar Institute for Marine Research: Brage IMR Norway Aquaculture Environment Interactions 1 2 167 174 |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
salmon fatty acids laks fettsyrer VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Aquaculture: 922 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 |
spellingShingle |
salmon fatty acids laks fettsyrer VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Aquaculture: 922 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 Olsen, Rolf Erik Skilbrei, Ove Feeding preference of recaptured Atlantic salmon Salmo salar following simulated escape from fish pens during autumn |
topic_facet |
salmon fatty acids laks fettsyrer VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Aquaculture: 922 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 |
description |
Escapes of farmed fish from coastal farms around the world are believed to have genetic and ecological consequences for wild fish populations. Each year there are numerous escapes of adult farmed Atlantic salmon Salmo salar. However, survival until maturity appears to be low. One possible explanation is that many of these salmon have difficulties switching to live prey. To address this possibility, growth rate and dietary preference were recorded in recaptured salmon released in 3 groups from August to October 2008 within a small fjord in south-western Norway (Masfjord). The fish were primed with a commercial diet containing 11% of the ‘vegetable oil marker’ 18:2n-6 before release. In the 14.5 to 35.1% of fish recaptured, growth rates were generally good (0.21–1.23% d–1 of fish recaptured in main fjord >2 mo after release), with body weight doubled or more for fish recaptured after 19 wk and thereafter. However, fish recaptured in a small arm of Masfjord (Hopsvåg) had a growth rate close to zero and were in poor condition. While stomachs of recaptured fish were generally empty in the first weeks after release, pellets from fish farms were found in more than 80% of the stomachs after 12 wk and thereafter. Additionally, the level of 18:2n-6 in depot lipids (11% of fatty acids) of the muscle indicated that none of the fish recaptured the following autumn and winter in the vicinity of the release site had switched to wild prey diets. Salmon that escape during autumn are unlikely to compete for prey with wild fish in the vicinity of the release site. |
format |
Article in Journal/Newspaper |
author |
Olsen, Rolf Erik Skilbrei, Ove |
author_facet |
Olsen, Rolf Erik Skilbrei, Ove |
author_sort |
Olsen, Rolf Erik |
title |
Feeding preference of recaptured Atlantic salmon Salmo salar following simulated escape from fish pens during autumn |
title_short |
Feeding preference of recaptured Atlantic salmon Salmo salar following simulated escape from fish pens during autumn |
title_full |
Feeding preference of recaptured Atlantic salmon Salmo salar following simulated escape from fish pens during autumn |
title_fullStr |
Feeding preference of recaptured Atlantic salmon Salmo salar following simulated escape from fish pens during autumn |
title_full_unstemmed |
Feeding preference of recaptured Atlantic salmon Salmo salar following simulated escape from fish pens during autumn |
title_sort |
feeding preference of recaptured atlantic salmon salmo salar following simulated escape from fish pens during autumn |
publisher |
Inter-Research |
publishDate |
2010 |
url |
http://hdl.handle.net/11250/117160 https://doi.org/10.3354/aei00015 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
167-174 1 Aquaculture Environment Interactions 2 |
op_relation |
urn:issn:1869-215X urn:issn:1869-7534 http://hdl.handle.net/11250/117160 http://dx.doi.org/10.3354/aei00015 |
op_doi |
https://doi.org/10.3354/aei00015 |
container_title |
Aquaculture Environment Interactions |
container_volume |
1 |
container_issue |
2 |
container_start_page |
167 |
op_container_end_page |
174 |
_version_ |
1766362502433603584 |